1999-2003 of release
Repair and operation of the car
Subaru of Legasi, Autbek
+ Cars Subaru Legacy, Outback
+ Operation manual
+ Routine maintenance
+ Cooling systems, heating
- Power supply system and release
+ System of injection of fuel
- Control systems of the engine and decrease in toxicity of the fulfilled gases
ESM - check of serviceability of a state and replacement
Diagnostics of malfunctions - the general information and preliminary checks
System of onboard self-diagnostics (OBD) - the general information
Application of an oscillograph for supervision of working parameters of a control system
Removal and installation of components of systems of decrease in toxicity of the fulfilled gases
+ System of production of the fulfilled gases
+ Electric equipment of the engine
+ Manual box and differential
+ Automatic transmission
+ Brake system
+ Suspension bracket and steering
+ Onboard electric equipment
Control systems of the engine and decrease in toxicity of the fulfilled gases
General informationFunction chart of control systems of engine/decrease in toxicity of the fulfilled gases (the l models 2.0 and 2.5 equipped with system of diagnostics of OBD II)
Function chart of control systems of engine/decrease in toxicity of the fulfilled gases (the l models 2.0 and 2.5 equipped with OBD Subaru)
Function chart of control systems of engine/decrease in toxicity of the fulfilled gases (model of 3.0 l)
Monitoring of composition of air and fuel mix
For the purpose of decrease in level of issue in the atmosphere of the toxic components getting to composition of the fulfilled engine gases as a result of evaporation and incompleteness of combustion of fuel and also for maintenance of efficiency of return of the engine and decrease in fuel consumption, the cars considered in the present manual are equipped a number of special systems which can be united under the general name of control systems of the engine and decrease in toxicity of the fulfilled gases. The complete set of systems depends on year of release of models and the region, on whose market the car is delivered. Full information on type and structure of systems is given in the information label of VECI fixed under a cowl.
It is necessary to carry the following to number of the systems concerning management of operation of the engine and control of toxicity of the fulfilled gases (depending on a complete set):
a) System of ignition (see the Head Elektrooborudovaniye of the engine);
b) System of catching of fuel evaporations (EVAP);
c) System of recirculation of the fulfilled gases (EGR) (model of 3.0 l);
d) System of the operated ventilation of a case (PCV);
e) Catalytic converter(s);
f) The conductor of a jellied mouth of a fuel tank (under the filling gun of columns of pouring of unleaded gasoline);
g) System of onboard diagnostics (OBD).
Functioning of all transferred systems, anyway, directly or indirectly, is connected with management of decrease in toxicity of the fulfilled gases. In the Sections given below the general descriptions of the principles of functioning of each of systems are given, and also procedures of diagnostic checks and recovery repair (if that is obviously possible) separate components which performance lies within qualification of the average amateur mechanic are stated
Before coming to conclusion about refusal of toxicity, any of systems of decrease, attentively check serviceability of functioning of power supply systems and ignition. Diagnostics of some of knots of systems of decrease in toxicity demands use of the special difficult equipment in application and a certain qualification of the performer, and therefore, its performance will be reasonable to be charged to professional mechanics of specialized car repair shop. Told above does not mean that service and repair of components of systems of decrease in toxicity in practice are represented exigeant. It is necessary to remember that one of the most common causes of refusals is elementary violation of quality of connections of vacuum or electric lines, and therefore, first of all it is always necessary to check a condition of the corresponding electric and nipple sockets. The owner of the car can independently and it is rather easy to make a number of checks, and also, to execute a set of procedures of routine maintenance of the majority of components of systems in house conditions, using thus a usual set of the adjusting and metalwork tool.
Try to observe everything the precautionary measures stipulated in the following Sections when performing service of electronic components of the considered systems. It is necessary to notice that illustrative material can not always correspond in accuracy to real placement of components on the car. Such discrepancies are connected with continuously happening process of modification within a standard design of each model.
Control system of the engine
Module of management (ECM)
ECM represents the electronic module on the basis of the microprocessor which on the basis of the analysis of the signals arriving from various information sensors exercises control of functioning of systems of injection, ignitions and decrease in toxicity of the fulfilled gases.
The tasks which are carried out by ECM are among:
a) Management of fuel injection parameters;
b) Management of ignition parameters;
c) Management of functioning of system of stabilization of turns of idling (IAC);
d) Management of functioning of EVAP system;
e) Management of functioning of the fan of the cooling system;
f) Management of functioning of the fuel pump;
g) Management of functioning of EGR system (model of 3.0 l);
i) Activation of emergency parameters of the failed subsystems.
When ECM develops output signals of the fixed level without the signals arriving from a lambda probe(s) say that the control system functions in the mode of "an open contour", i.e., without feedback. If the module starts processing information issued by the oxygen sensor(s), the mode becomes "closed" that allows ECM to correct parameters of injection and ignition taking into account the current operational characteristics of the engine (turns, loading, temperature, and so forth).
In memory of the module emergency values (values by default) the main working parameters of all subsystems of management are put. These parameters are activated in case of identification of refusal of the corresponding subsystem, providing adequacy of functioning of the engine (with inevitable loss of efficiency of return).
Refusal of any subject to monitoring from the block of self-diagnostics of a component is fixed in memory of the module in the form of the corresponding five-digit code (DTC) which reading can be made by means of the special scanner (see the Section System of Onboard Self-diagnostics (OBD) - the general information).
Supply of fuel and configuration of air and fuel mix
Tracing and analyzing the data arriving from the corresponding information sensors, ECM determines necessary parameters of supply of fuel (quantity and the moments of injection). The module exercises continuous consecutive control of injection under any service conditions of the engine, except the warming up moments at start.
The amount of the fuel injected into the engine is defined by duration of opening of needle valves of injectors.
The moment of injection is calculated taking into account maximum efficiency of air supply in each of engine cylinders (fuel is injected just before the moment of the beginning of opening of the inlet valve).
During warming up of the engine at start duration of opening of injectors is defined by the ECM sensor according to change of temperature of cooling liquid. After the engine gets warm up to the normal working temperature, the following scheme of determination of duration of injection joins: "Basic value x Adjustment parameters + Variable of compensation of change of level of tension". Thus basic value of duration of opening of an injector is defined by two major factors: amount of the air given to the engine (on pressure sensor signals in the pipeline) and the current frequency of rotation of the engine (on CKP sensor signals). Adjustment parameters are considered below. The compensation variable is urged to compensate the temporary delays of operation of injectors connected with battery tension variations.
The organization of the listed below adjustments allows to correct in due time basic value of duration of opening of injectors for the purpose of maintenance of optimum quality of air and fuel mix at any parameters of functioning of the engine.
· Correction of composition of air and fuel mix on signals dokatalitichesky a lambda probe. On the models equipped with the catalytic converter the lambda probe which is given out dokatalitichesky information on the level of the content in the fulfilled gases of oxygen allows ECM to correct in due time a dosage of supply of fuel for the purpose of prevention of noticeable deviations of quality of gas mixture from stekhiometrichesky value;
· Starting correction of composition of mix. At the time of a provorachivaniye of a cranked shaft at start duration of opening of injectors forcibly increases for the purpose of maintenance of stability of turns of the engine;
· Correction of composition of mix during warming up of the engine. This adjustment (the temperature of cooling liquid is lower, the injection duration is more) is carried out on the basis of the data issued by the ECT sensor and ECM for stabilization of turns of the engine is used during its warming up;
· Post-starting adjustment. This adjustment allows to stabilize engine turns at the moment directly after implementation of its start (also information on temperature of cooling liquid delivered by the ECT sensor is considered);
· Correction of composition of mix at full opening of a butterfly valve. At full opening of a butterfly valve duration of time of opening of injectors increases according to information arriving from TPS and the sensor of pressure in the inlet pipeline;
· Correction of composition of mix during acceleration. This adjustment is urged to compensate a temporary delay of definition of amount of the soaked-up air for the purpose of increase of sensitivity of the engine on manipulation with a gas pedal during acceleration.
On the considered models correction of composition of air and fuel mix on signals dokatalitichesky the lambda probe is organized intellectually. The essence of the told is concluded in the following: during management of composition of the mix ECM on the basis of the analysis of information arriving from the oxygen sensor calculates the correcting variable which then is added to put in memory of the processor (corresponding to the current turns of the engine) to basic value of duration of time of opening of injectors, thus sensitivity and reactivity of system of subjects is lower, than the size of the demanded temporary additive is more noticeable. The intellectual organization of process allows to bypass this situation due to continuous correction of basic value by addition to it the last correcting additive and preservation of total value in random access memory of the processor, thus, the size of the next adjustment is significantly reduced, and efficiency of functioning of system increases.
Ignition of gas mixture
The scheme of management of ignition parameters on l models 2.0 and 2.5
The scheme of management of ignition parameters on models of 3.0 l
ECM continuously traces the current working condition of the engine on the signals arriving from sensors of pressure, temperature of cooling liquid, temperature of the soaked-up air of provision of a cranked shaft and so forth. On the basis of the analysis of the received information of ECM selects optimum (from put in memory of the processor) the ignition moment at which gives out a signal of interruption of primary contour on the ignition module.
At management of ignition intellectual function (function of fast recognition) in which the data which are written down in memory by ECM are compared to information arriving from information sensors and sensors switches is also used. So, at an ignition moment choice for any operating conditions of the ECM engine processes information on the output power of the power unit, fuel consumption, composition of the fulfilled gases and so forth. During start of the engine fluctuations of its turns in view of what the module of management is not capable to control adequately an ignition advancing corner therefore for this period the corner is forcibly exposed on 10 ° before VMT on a special signal "10 °" the CKP sensor always take place.
The main objectives of the device is compensation of increase of load of the engine at activation To/in or other power-intensive consumer of the electric power, increase of turns of idling of the engine in an initial stage of its warming up, ensuring buffer effect at fast closing of a butterfly valve, and also increase of stability of turns of the engine idling.
Being guided by information delivered by the sensor of provision of a camshaft (CMP), ECM provides management functioning of the fuel pump by inclusion/switching off of its relay. For the purpose of increase of level of safety the fuel pump is automatically blocked at spontaneous stops of the engine at the included ignition. The principle of the organization of management is formulated in the table given above.
The PCV system serves for decrease in issue in the atmosphere of hydrocarbonic connections at the expense of a conclusion from the engine of karterny gases.
Three-functional catalytic converter (TWC)
The catalytic converter(s) is a component of systems of decrease in toxicity of the fulfilled gases, is switched on in structure of system of release and serves for decrease in issue in the atmosphere of toxic components. There are two types of catalytic converters. The ordinary oxidizing converter allows to lower the content in the fulfilled gases of hydrocarbons (NANOSECOND) and carbon monoxide (WITH). The three-functional catalytic converter (TWC) in addition allows to reduce emission of nitrogen oxides (NOH). On all models considered in the present manual three-functional catalytic converters are used.
Maximum efficiency of functioning of the catalyst is reached at a certain concentration in the fulfilled gases of toxic components. The demanded balance is reached due to control of composition of air and fuel mix which the control system tries to support constantly near the value equal to stekhiometrichesky number, - see the following subsection.
The system on the basis of the signals which are continuously arriving dokatalitichesky a lambda probe(s) makes the corresponding corrections of basic value of duration of opening of injectors for the purpose of maintenance of quality of air and fuel mix near the stekhiometrichesky value (14.7 parts of air on 1 part of fuel) providing optimum conditions for functioning of the three-functional catalytic converter (TWC).
The intellectual correction of the current basic values allowing to increase considerably reactivity of responses to the happening changes is also provided in system.
Scheme of functioning of a control system of ignition of the 6-cylinder engine
Principle of functioning of EGR system
The scheme of functioning of system of catching of fuel evaporations (EVAP) on l models 2.0 and 2.5 (on models of 3.0 l the scheme is organized similarly)
On the basis of the analysis of the arriving information of ECM calculates optimum values of a corner of an advancing and porosity of the operating ignition impulses for any current working parameters of the engine. In the work of ECM uses the program card of management on the closed contour providing magnificent reactivity of responses to any changes of the entering data.
Design of the safety valve (And) cover of a jellied mouth of a fuel tank
Design of the coal adsorber used on models with OBD II
Design of the coal adsorber used on l models 2.0 and 2.5 with OBD Subaru
Design of the electromagnetic valve of a purge of an adsorber on l models 2.0 and 2.5
Design of the electromagnetic valve of a purge of an adsorber on models of 3.0 l
Design of the double-thread valve installed on models with OBD II
Design of the double-thread valve installed on models with OBD Subaru (l models 2.0 and 2.5)
The locking valve is built in directly a vaporizing tube of a cover of a fuel tank. Rise in level of fuel in a tank leads to locking of an opening in a cover, leaving it the only exit through a vaporizing tube in a coal adsorber.
The scheme of laying of vacuum lines on models 2.0 and 2.5 of the l equipped with system of onboard diagnostics of OBD II
The scheme of laying of vacuum lines on models 2.0 and 2.5 of the l equipped with OBD Subaru
The scheme of laying of vacuum lines on models of 3.0 l (OBD II)